JP5928720B2 - Electric working machine - Google Patents

Description

  The present invention relates to an electric working machine such as an electric brush cutter.

  For example, as shown in Patent Document 1 below, the electric brush cutter has a shape that extends long in the front-rear direction as a whole. The operator carries out the mowing work with the cutting blade on the front end side of the electric brush cutter positioned near the ground while wearing the shoulder band of the electric brush cutter to support the entire weight. For this reason, it is desirable for the electric brush cutter to have a front-rear balance such that the cutting blade on the front end side is located near the ground without applying any particular force.

  On the other hand, when using a cordless electric work machine in which a battery pack is detachably mounted, there is a case where power is supplied from an external power source such as a backpack type power supply device (backpack power source). The external power source has a large battery capacity compared to a battery pack that can be directly attached to and detached from the cordless electric working machine, and is therefore suitable for long-time work. When power is supplied from an external power supply, the adapter at the end of the cable extending from the external power supply is attached to the cordless electric working machine instead of the battery pack. Since the adapter does not contain battery cells, the adapter is lighter than the battery pack. For this reason, when the adapter is attached to the cordless electric working machine instead of the battery pack, the position of the center of gravity changes as compared to when the battery pack is attached. Further, since the weight of the battery pack also changes depending on the capacity, the position of the center of gravity changes depending on the capacity of the battery pack to be mounted. In particular, in a working machine in which heavy objects are located at both ends of a long operation rod such as a brush cutter, there is a problem that it is greatly affected by a moment.

JP 2010-200673 A

  The center of gravity position of the optimal front / rear balance of the electric brush cutter varies depending on the product conditions such as the front / rear length and length adjustment unit of the electric brush cutter and the position and length of the shoulder band, and the height, body shape, It depends on the senses. In addition, if the center of gravity position of the electric working machine is different depending on what capacity of the battery pack is installed, or depending on the work of attaching the adapter at the tip of the cable extending from the external power supply instead of the battery pack, Gives the operator a sense of incongruity.

  The present invention has been made in view of such a situation, and a first object thereof is to provide an electric working machine capable of adjusting the position of the center of gravity.

  The second object of the present invention is that the change in the position of the center of gravity between the case where the battery pack operates with the power of the battery pack and the case where the battery pack operates with the power from the external power source is small compared with the case where the adapter is attached instead of the battery pack. It is to provide a working machine.

One embodiment of the present invention is an electric working machine. This electric work machine
With a universal housing detachable battery, Ri detachably der the weight on the housing,
A hole is provided in the housing, and the weight is disposed in the hole,
Wherein the Ru with a cover portion covering the opening of the hole.

The opening of the hole may be a stepped portion, and the cover portion may be engaged with the stepped portion.

The hole may be a through hole, and the cover may be provided in both openings of the hole.

The shaft includes a shaft portion extending from at least one of the cover portions into the hole portion, and the weight includes a plurality of plates each having a through hole through which the shaft portion passes, and both cover portions are mutually connected via the shaft portion. It may be detachably fixed to.

The shaft portion may extend from the cover portion into the hole portion, and the weight may include a plurality of plates each having a through hole through which the shaft portion passes.

An elastic body having a through-hole through which the shaft portion passes may be provided, and when the elastic body is arranged side by side on the plate, sliding of the plate in the axial direction may be restricted.

Another aspect of the present invention is an electric working machine. The electric working machine includes a housing in which a battery is detachable and an adapter that is detachable from the housing and receives electric power from an external power source instead of the battery, and the adapter is provided with a weight.

Another aspect of the present invention is an electric working machine. The electric working machine includes a housing in which a battery is detachable, a dummy pack that is detachable from the housing in place of the battery, and an adapter that is attached to the dummy pack and receives power from an external power source. There is a weight on the door.

Another aspect of the present invention is an electric working machine. The electric working machine includes a housing in which a battery is detachable and an adapter that is detachable from the housing and receives electric power from an external power source in place of the battery, and a weight is detachable from the housing.

Another aspect of the present invention is an electric working machine. This electric work machine
A housing in which a battery containing a battery cell is removable,
An adapter detachable from the housing instead of the battery;
Via a cable and capable of supplying power to said adapter, and a backpack battery work skill to wear,
A weight can be freely attached to and detached from the housing,
The position of the center of gravity when the adapter and the weight are attached to the housing is greater than the position of the center of gravity when the adapter is attached to the housing and the weight is not attached, and the weight is attached to the housing and the weight. It is characterized in that it is close to the position of the center of gravity in a state where the is not attached.

The weight may be configured such that the weight can be changed .

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  According to the first aspect of the present invention, an electric working machine capable of adjusting the position of the center of gravity can be realized.

  According to the second aspect of the present invention, the change in the position of the center of gravity between when operating with the power of the battery pack and when operating with the power from the external power supply is compared with the case where the adapter is attached instead of the battery pack. A small electric working machine can be realized.

The perspective view of the brush cutter which concerns on embodiment of this invention. FIG. 2 is a schematic diagram showing a state where an operator has the brush cutter of FIG. 1. The enlarged side view of the battery side housing 3 of the brush cutter of FIG. AA sectional drawing of FIG. (A) is a front view of the weight unit 18 shown in FIG. 4, (B) is the bottom view, (C) is the right side view, and (D) is the back view. FIG. 5 is an exploded view of the weight unit 18 shown in FIG. 4. 1 is an external view of a backpack-type battery 16. The perspective view of the hedge trimmer which concerns on embodiment of this invention. The schematic diagram of the structure which adjusts the gravity center position of an electrically-driven working machine (the 1). The schematic diagram of the structure which adjusts the gravity center position of an electrically-driven working machine (the 2). The schematic diagram of the structure which adjusts the gravity center position of an electrically-driven working machine (the 3). The schematic diagram of the structure which adjusts the gravity center position of an electrically-driven working machine (the 4).

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are examples, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIG. 1 is a perspective view of a brush cutter according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a state in which an operator has the brush cutter of FIG. FIG. 3 is an enlarged side view of the battery side housing 3 of the brush cutter of FIG. 4 is a cross-sectional view taken along line AA in FIG. 1 to 3 show a weight non-mounted state, and FIG. 4 shows a weight mounted state. FIG. 5A is a front view of the weight unit 18 shown in FIG. 5B is a bottom view thereof, FIG. 5C is a right side view thereof, and FIG. 5D is a rear view thereof. FIG. 6 is an exploded view of the weight unit 18 shown in FIG. FIG. 7 is an external view of the backpack-type battery 16.

  A brush cutter, which is an example of an electric working machine, includes an operation rod 1, a cutting blade unit 2, a battery-side housing 3, a band connection portion 4, a shoulder band 5, a length adjustment unit 6, and a handle portion 20. Is provided. The cutting blade unit 2 is provided at the tip of the operating rod 1 and has, for example, a disk motor in the head housing 2a for driving a cutting blade (not shown) (substantially disk-shaped and having saw teeth on its periphery). The battery-side housing 3 is provided at the rear end of the operation rod 1, and a battery pack 301 (battery) as a battery is detachable. The operating rod 1 mechanically connects (links) the cutting blade unit 2 and the battery side housing 3. Further, a wiring (not shown) for electrically connecting the cutting blade unit 2 and the battery side housing 3 is inserted into the operation rod 1. Power is supplied from the battery side housing 3 to the cutting blade unit 2 by this wiring. The band connecting portion 4 is provided at a predetermined position of the operation rod 1 and a shoulder band 5 can be attached thereto. The length adjustment unit 6 can adjust the length of the operation rod 1. The handle portion 20 is provided at a predetermined position of the operation rod 1. Although the handle portion 20 is for one hand in the illustrated example, the handle portion 20 may be for two hands divided into two. The rotation speed of the cutting blade is adjusted by adjusting the pulling amount of the operation lever 21. If the pulling amount is increased, the amount of power supplied from the battery side housing 3 to the cutting blade unit 2 is increased, and the rotational speed of the cutting blade is increased.

  The operator wears the shoulder band 5 as shown in FIG. 2, and the cutting blade unit 2 is held near the ground by tilting the operating rod 1 with the band connecting portion 4 connected to the shoulder band 5 as a fulcrum. Thus, the brushing work is performed by reciprocating the operating rod 1 to the left and right. For this reason, it is desirable that the center of gravity position of the front-rear balance of the brush cutter is in a state where the distance between the ground and the cutting blade unit 2 is the shortest, or a state where the cutting blade unit 2 is in light contact with the ground. That is, if the position of the center of gravity is too front, the cutting blade unit 2 is lifted and the workability is poor. On the other hand, if the position of the center of gravity is too back, the moment due to the weight of the cutting blade unit 2 is large and the workability is poor. It is important in terms of workability to appropriately determine the position of the center of gravity. However, the position of the center of gravity of the optimum front / rear balance of the brush cutter varies depending on the product conditions such as the length and length adjustment unit 6 of the operation rod 1 and the position of the shoulder band 5 (position of the band connecting portion 4) and length. However, it varies depending on the height, body shape, and sense of the worker. Further, when the battery pack 301 is removed and, for example, the adapter 17 of the backpack type battery 16 shown in FIG. 7 (installed at the tip of the cable 16b extending from the battery main body 16a) is attached instead, the adapter 17 does not include the battery cell. Since it is lighter than 301, the center of gravity position of the brush cutter changes (shifts forward).

  Therefore, in the present embodiment, the center of gravity position of the brush cutter can be adjusted afterwards, so that the optimum center of gravity position can be obtained even if the product conditions, the operator, or how to take the power supply are different.

  The battery side housing 3 has a hole 7 for inserting a weight. The hole 7 is also assumed to be used as a handle, and is provided in the upper part of the battery-side housing 3 so that the finger does not feel strange even when the finger is inserted. As shown in FIG. 4, the weight unit 18 is attached (attached) to the hole 7.

  As shown in FIGS. 4 to 6, the weight unit 18 includes a plurality of weights 8 (weights), a front cover 14, screws 15, a back cover 12, and nuts 13. The plurality of weights 8 are, for example, iron plates having the same shape. The front cover 14 and the back cover 12 are, for example, iron plates that are slightly larger than the weight 8. The nut 13 is fixed to the back cover 12 so as to rise from a predetermined position (for example, the center) of the back cover 12 (for example, welded and integrated). The screw 15 is screwed onto the nut 13. As shown in FIG. 6, the weight 8 and the front cover 14 are provided with through holes 8a and 14a. At least one of the screw shaft 15a of the screw 15 and the nut 13 of the back cover 12 passes through the through holes 8a and 14a. By tightening the screw 15 with respect to the nut 13, the weight 8 is sandwiched between the front cover 14 and the back cover 12.

  The front cover 14 has a larger diameter than the hole 7 and covers one opening of the hole 7 entirely. Similarly, the back cover 12 has a larger diameter than the hole 7 and covers the other opening of the hole 7 entirely. The opening of the hole 7 is a stepped portion 9, and the front cover 14 and the back cover 12 engage with the stepped portion 9 (preferably just fit). The width of the cover abutting surface of the step portion 9 is 2 mm, for example. The front cover 14 and the back cover 12 that are slightly larger than the weight 8 hold down the plurality of weights 8 that are received in the hole 7 provided in the battery-side housing 3 from both ends. It is fixed so that there is no movement in the up / down / left / right / front / rear direction. When the weight unit 18 is assembled, the weight 8 and the front cover 14 are passed through the nut 13 attached to one side of the back cover 12, and the screw 15 is passed through the nut 13 from the front cover 14 side and tightened. The number of weights 8 can be arbitrarily selected according to the amount of adjustment of the center of gravity. At this time, if the number of the weights 8 is reduced, a gap is generated between the front cover 14 and the back cover 12, and the weight 8 moves in the axial direction of the screw 15. The gap corresponding to the reduced number of the weights 8 is shown in FIG. As shown, by filling with an elastic body 19 such as a sponge, the movement of the weight 8 (sliding along the axis) can be restricted.

  As shown in FIG. 4, a heat radiating plate 32 (for example, made of aluminum) having an L-shaped cross section is fixed in the battery housing 3 at a position below the hole 7, and a substrate 31 is fixed to the heat radiating plate 32 with screws. ing. The L-shaped rising portion 32a of the heat radiating plate 32 is in close proximity to the inner surface of the hole 7 and has good heat dissipation.

  According to the present embodiment, by attaching the weight unit 18 to the hole 7 of the battery-side housing 3, the center of gravity position of the brush cutter can be adjusted afterwards. In addition, the number of weights 8 used in the weight unit 18 (that is, the weight of the weight unit 18) can be arbitrarily selected according to the adjustment amount of the center of gravity position, and flexible center of gravity position adjustment is possible. For this reason, even if the product conditions, the operator, or the way of taking the power supply are different, the optimum center of gravity can be obtained, and the workability is improved. That is, it is possible to adjust the center of gravity position with good work efficiency according to the operator's own judgment corresponding to the specifications of the brush cutter, the capacity of the battery pack to be installed, the presence / absence of use of the external power supply, the height of the worker, and the body shape. Furthermore, since it is possible to take various positions of the center of gravity with the same brush cutter, the environmental load can be reduced.

  FIG. 8 is a perspective view of the hedge trimmer according to the embodiment of the present invention. The electric working machine is not limited to the brush cutter shown in FIG. 1 or the like, and may be, for example, a hedge trimmer shown in FIG. This hedge trimmer has a weight insertion hole 7 in a support portion 3b of the housing 3 on which the battery pack 301 is detachably mounted and which opposes the grip portion 3a. A weight unit 18 can be attached to the hole 7 as in the case of the brush cutter.

  FIG. 9 is a schematic diagram (part 1) of the configuration for adjusting the position of the center of gravity of the electric working machine. The example of this figure attaches a weight directly to the housing 3, and corresponds to the above-described embodiment. When the large-capacity battery pack 301 is attached, the weight is not attached (FIG. 9 (A)), and when the small-capacity battery pack 301 is attached, the small weight is attached (FIG. 9 (B)). When power is supplied from an external power source such as the backpack-type battery 16 (when the adapter 17 is attached instead of the battery pack 301), a large weight is attached (FIG. 9C).

  FIG. 10 is a schematic diagram (part 2) of the configuration for adjusting the position of the center of gravity of the electric working machine. In the example shown in the figure, a weight is added to the adapter 17 itself when power is supplied from an external power source such as the backpack-type battery 16 (when the adapter 17 is attached instead of the battery pack 301). Since there is no battery cell inside the adapter 17 and there is an extra space, a weight such as iron may be put therein. The weight of the weight should be variable. Thereby, it can be set as the optimal center-of-gravity position also when attaching adapter 17 instead of battery pack 301.

  FIG. 11 is a schematic diagram (part 3) of the configuration for adjusting the position of the center of gravity of the electric working machine. In the example of this figure, when power is supplied from an external power source such as the backpack-type battery 16 or the like, the adapter 17 is attached to the battery pack 301 without removing the battery pack 301. When the capacity of the battery pack 301 becomes a predetermined amount or less, electric power is supplied from the shoulder-type battery 16. In this case, although the weight is increased by the amount of the adapter 17, the adapter 17 is light and has almost no influence on the position of the center of gravity as a whole.

  FIG. 12 is a schematic diagram (part 4) of the configuration for adjusting the position of the center of gravity of the electric working machine. In place of the battery pack 301 of FIG. 11, a dummy pack 302 is attached to the housing 3, and the adapter 17 is attached to the dummy pack 302. The dummy pack 302 has the same or similar outer shape as the battery pack 301, but does not incorporate battery cells and has a weight inside. The weight of the weight should be variable. Thereby, it can be set as the optimal gravity center position.

  The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, modifications will be described.

  The electric working machine may be various electric tools such as a belt sander, a rotary band saw, a blower, and a chain saw in addition to those shown in the embodiment.

  The weight unit 18 may be attached to, for example, the lower surface of the battery side housing 3 instead of the hole 7 of the battery side housing 3.

1 Operation rod, 2 Cutting blade unit, 3 Housing, 301 Battery pack, 302 Dummy pack, 4 Band connection part, 5 Shoulder band, 6 Length adjustment unit, 7 Hole part, 8 Weight (weight), 12 Back cover, 13 Nut, 14 Front cover, 15 Screw, 16 Backpack battery, 17 Adapter, 18 Weight unit, 19 Elastic body, 20 Handle part

Claims (11)

A battery is provided with a detachable housing, and a weight can be detachably attached to the housing.
A hole is provided in the housing, and the weight is disposed in the hole,
An electric working machine comprising a cover portion that covers the opening of the hole portion.   The electric working machine according to claim 1, wherein the opening of the hole portion is a stepped portion, and the cover portion is engaged with the stepped portion.   The electric working machine according to claim 1 or 2, wherein the hole portion is a through hole, and the cover portion is provided in both openings of the hole portion.   The shaft includes a shaft portion extending from at least one of the cover portions into the hole portion, and the weight includes a plurality of plates each having a through hole through which the shaft portion passes, and both cover portions are mutually connected via the shaft portion. The electric working machine according to claim 3, which is detachably fixed to the machine.   5. The electric motor according to claim 1, further comprising: a shaft portion extending from the cover portion into the hole portion, wherein the weight includes a plurality of plates each having a through-hole through which the shaft portion passes. Work machine.   6. The electric working machine according to claim 4, comprising an elastic body having a through-hole through which the shaft portion passes, and restricting sliding of the plate in an axial direction when the elastic body is arranged side by side on the plate.   An electric work machine comprising: a housing in which a battery is detachable; and an adapter that is detachable from the housing and receives electric power from an external power source in place of the battery, and the adapter is provided with a weight.   A battery housing, a dummy pack that is detachable from the housing instead of the battery, and an adapter that is attached to the dummy pack and receives power from an external power source, wherein the dummy pack is provided with a weight. Electric working machine.   An electric working machine comprising: a housing in which a battery is detachably attached; and an adapter that is detachably attached to the housing and receives electric power from an external power source in place of the battery, and a weight is detachably attached to the housing. A housing in which a battery containing a battery cell is removable,
An adapter detachable from the housing instead of the battery;
Via a cable and capable of supplying power to said adapter, and a backpack battery work skill to wear,
A weight can be freely attached to and detached from the housing,
The position of the center of gravity when the adapter and the weight are attached to the housing is greater than the position of the center of gravity when the adapter is attached to the housing and the weight is not attached, and the weight is attached to the housing and the weight. An electric working machine characterized by being close to the position of the center of gravity in a state in which the is not attached. The electric work machine according to any one of claims 1 to 10 , wherein the weight is configured such that the weight can be changed.